help on strange dig info

[Tech W.]

Hello,


I digged a domain name as below:

root at DEV1:~# dig www.csfunds.com.cn

; <<>> DiG 9.5.0-P2 <<>> www.csfunds.com.cn
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23283
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;www.csfunds.com.cn.            IN      A

;; ANSWER SECTION:
www.csfunds.com.cn.     86149   IN      CNAME   www.f5.csfunds.com.cn.
www.f5.csfunds.com.cn.  30      IN      A       124.207.40.24

;; AUTHORITY SECTION:
f5.csfunds.com.cn.      85769   IN      NS      lc2.f5.csfunds.com.cn.
f5.csfunds.com.cn.      85769   IN      NS      lc1.f5.csfunds.com.cn.


It said f5.csfunds.com.cn's nameservers are lc1.f5.csfunds.com.cn and lc2.f5.csfunds.com.cn.


But, I can't dig the info for both lc1 and lc2.

root at DEV1:~# dig lc1.f5.csfunds.com.cn

; <<>> DiG 9.5.0-P2 <<>> lc1.f5.csfunds.com.cn
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 29538
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;lc1.f5.csfunds.com.cn.         IN      A


root at DEV1:~# dig lc2.f5.csfunds.com.cn

; <<>> DiG 9.5.0-P2 <<>> lc2.f5.csfunds.com.cn
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 39091
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;lc2.f5.csfunds.com.cn.         IN      A



This let me really confused.
When clients can't get IP addr for lc1 and lc2, how clients query the domain records in zone of f5.csfunds.com.cn?

Thanks for your helps.

Regards.
Ken.


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